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Hi, yep you can just unscrew the innards of a pgp and swap them out. It's a good idea to keep the empty body because the pgp threads will on occasion split open.
As far as adjusting goes, it's fairly simple once you get the hang of it. You may find it tricky at first. You have to physically turn the sprinkler to the right where you want the water to go. Then use the tool to adjust how far you want to it to turn to the left.

same problem

I am having the same problem....have a good stream of water that is leaking off into my driveway when my rotors pop up..they still spray fine just leaking.....I also have one the lawmower clipped the top off on.....being new to this, is it correct if you twist out the insides there is no need to dig and unscrew the body from the actually pipe?

Leaking seals are a major failure point with Hunter rotors, because the tolerances are so fine. I would place little faith in replacement seals, but who knows, you might luck out. The rotor mechanism itself is likely to work for a long time yet. Make sure replacement heads aren't set too low, as it accellerates wearing of the seals.

Hunter PGP Rotor Leaks

I have several Hunter PGP rotors that have developed leaks between the Pop-up Body and the Body Cap. I noticed on the Hunter drawing that there is a Seal Replacement Kit available. Is the kit a.) likely to fix my problem?; b.) worth the effort compared to just replacing the entire assembly?; c.) is the kit available?

I am also curious why I have several of these rotors leaking and if it's due to the relatively cold winter (in Houston, not Minnesota)? The house/sprinkler system is about five years old, but I just bought the house last fall and don't really know if this problem was pre-existing.